[Rails] Re: il.add_index question

I see what your saying yeah, that could work.  Before I add it to the
table, I would get it in the form id1 < id2 & then my previous index
would work the same way essentially catching both of the cases I was
describing.

Thanks for the help.
Steve

On Tue, Oct 13, 2009 at 3:22 AM, Colin Law <clanlaw@googlemail.com> wrote:
>
> 2009/10/13 steveb56 <steve.burke.56@gmail.com>:
> >
> > I have a table that is modeling a friendship between two players. I'd
> > like it so that there can only be one record for this friendship in
> > the table.  I have added an index to the table to make sure that a
> > record is unique like so ...
> >
> > id1  id2
> > 1    2
> > 1    2   # Error, record isn't unique
> >
> > add_index(:friendships, [:friend_id1, :friend_id2], :unique => true)
> >
> > I would also like to add an index to take care of the following
> > situation...
> >
> > id1  id2
> > 1    2
> > 2    1   # Error, since it's the same as the first record
>
> Could you setup your code so that for a friendship record id1 is
> always less than id2?  If there is no way in the code that id1=2 and
> id2=1 can occur then you do not need to protect against it.
>
> Colin
>
> >

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